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Composite coating electrode and preparing method thereof and electrolytic cell

A composite coating and electrode technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of short coating oxidation life, low current efficiency, and many cracks on the coating surface, achieve good application prospects, improve current Efficiency and long service life

Active Publication Date: 2015-10-21
HAINAN JINHAI PULP & PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the domestic traditional electrolytic production of sodium chlorate industry, binary oxide-coated titanium anodes with ruthenium-based coatings or iridium-based coatings are currently the most representative electrodes for industrial use. However, the surface of such coatings There are many cracks, poor bonding with titanium substrate, and easy to fall off, which results in a short life of enhanced oxidation of the coating
At the same time, the electrolytic cell has problems such as high voltage, low current efficiency, and high hydrogen and oxygen content generated by electrolysis.
Due to the high content of hydrogen and oxygen, the production of chlorate in general industry uses a large amount of nitrogen to dilute and then discharge directly and cannot be recycled, resulting in energy waste and certain safety hazards.

Method used

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  • Composite coating electrode and preparing method thereof and electrolytic cell
  • Composite coating electrode and preparing method thereof and electrolytic cell
  • Composite coating electrode and preparing method thereof and electrolytic cell

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Experimental program
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Effect test

Embodiment 1

[0027] 1) Use the mixture prepared by mixing sodium phosphate, 40g / L sodium carbonate, and 15g / L sodium hydroxide with a concentration of 30g / L, respectively, to TA1 cold-rolled pure titanium with a specification of 595mm×402mm×2mm after sandblasting. The board is chemically degreased, then etched with 10% Wt hot oxalic acid solution for 2 hours, and finally rinsed with distilled water, and put into ethanol for later use. Good pretreatment can increase the geometric area of ​​the titanium substrate, which can not only improve the bonding force with the coating, but also increase the electrocatalytic active surface area of ​​the anode.

[0028] 2) Weigh ruthenium trichloride and tetra-n-butyl titanate at a molar ratio of 1:5, carry out batching, dissolve in absolute ethanol, and mix to prepare coating liquid I.

[0029] 3) Dissolve chloroiridic acid and tantalum pentachloride in n-butanol at a molar ratio of 5:1 in absolute ethanol to prepare coating solution II.

[0030] 4) T...

Embodiment 2

[0035] 1) Use the mixture prepared by mixing sodium phosphate, 40g / L sodium carbonate, and 15g / L sodium hydroxide with a concentration of 30g / L, respectively, to TA1 cold-rolled pure titanium with a specification of 595mm×402mm×2mm after sandblasting. The board is chemically degreased, then etched with 10% Wt hot oxalic acid solution for 2 hours, and finally rinsed with distilled water, and put into ethanol for later use. Good pretreatment can increase the geometric area of ​​the titanium substrate, which can not only improve the bonding force with the coating, but also increase the electrocatalytic active surface area of ​​the anode.

[0036] 2) Weigh ruthenium trichloride and tetra-n-butyl titanate in a molar ratio of 3:7, carry out batching, dissolve in absolute ethanol, and mix to prepare coating liquid I.

[0037] 3) Dissolve chloroiridic acid and tantalum pentachloride in n-butanol at a molar ratio of 7:3 in absolute ethanol to obtain coating solution II.

[0038] 4) Th...

Embodiment 3

[0044] 1) Use the mixture prepared by mixing sodium phosphate, 40g / L sodium carbonate, and 15g / L sodium hydroxide with a concentration of 30g / L, respectively, to TA1 cold-rolled pure titanium with a specification of 595mm×402mm×2mm after sandblasting. The board is chemically degreased, then etched with 10% Wt hot oxalic acid solution for 2 hours, and finally rinsed with distilled water, and put into ethanol for later use. Good pretreatment can increase the geometric area of ​​the titanium substrate, which can not only improve the bonding force with the coating, but also increase the electrocatalytic active surface area of ​​the anode.

[0045] 2) Weigh ruthenium trichloride and tetra-n-butyl titanate in a molar ratio of 5:10, carry out batching, dissolve in absolute ethanol, and mix to prepare coating solution I.

[0046] 3) Dissolve chloroiridic acid and tantalum pentachloride in n-butanol at a molar ratio of 10:5 in absolute ethanol to prepare coating solution II.

[0047]4...

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Abstract

The invention discloses a composite coating electrode and a preparing method thereof and an electrolytic cell. The composite coating electrode comprises a conductive matrix and an electro-catalysis coating. The electro-catalysis coating is composed of ruthenium oxide, iridium oxide, tantalum pentoxide and titanium oxide. The electrolytic cell comprises an electrolyte, an anode, a cathode and a power source. The anode is coated with the electro-catalysis coating composed of the ruthenium oxide, the iridium oxide, the tantalum pentoxide and the titanium oxide. The preparing method of the composite coating electrode comprises the following steps that the pretreated electrode is coated with three kinds of coating liquid in sequence, and heat treatment is carried out every time coating is conducted. The composite coating electrode is long in service life, the voltage of the electrolytic cell is effectively reduced and the current efficiency is effectively improved through the electro-catalysis coating used in the composite coating electrode, and the oxygen content of generated hydrogen which is an electrolysis side product is low; meanwhile, the hydrogen can be recycled, and good application prospects are achieved.

Description

technical field [0001] The invention relates to the chlorate electrolysis industry, in particular to a composite coating electrode, a preparation method thereof and an electrolytic cell. Background technique [0002] The anode coating of the electrolytic cell plays a very important role in the electrolysis industry. All electrochemical reactions in the electrolysis process are carried out on the interface between the electrode surface and the electrolyte. Therefore, the electrolysis industry requires that the anode coating has better electrocatalysis and gas evolution selectivity, that is, a more suitable chlorine evolution potential and oxygen evolution potential. In addition, it should also have strong corrosion resistance, so as to reduce energy consumption. , Improve reaction efficiency, improve production stability and prolong service life, and finally achieve the purpose of reducing electrochemical reaction operating costs and improving product quality. [0003] In th...

Claims

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Application Information

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IPC IPC(8): C25B1/26C25B11/06
Inventor 谢勤李丽萍
Owner HAINAN JINHAI PULP & PAPER
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